[photo-3d] Re: Newbie question-near point distance

[Bruce Springsteen <bsspringsteen@xxxxxxxxx>]

George T. reported advice from David Lee as:

> - When using wide angle lenses double the separation.
> When using long lenses cut the separation in half.  Normal
> is 35mm or 50mm for 35mm film. Wide lens would be 28mm
> or 24mm.  Long lens would be 100 or 135mm."

Mike Davis advised:

> "New base = Original base * (Original Focal Length / New Focal Length)"

Both are recommendations to reduce base when increasing focal length, or
add base when subtracting focal length.  This is just the opposite of the
old PePax rule of increasing (or decreasing) base and focal length
together.  Though based on a fallacy suggesting that parallax and
perspective are reciprocal parts of orthostereo, PePax still served the
useful purpose of counteracting unpleasant "stretch" and "squeeze"
effects.  What purpose does the opposite advice serve?

A perpetual newbie. ;-)



__________________________________________________
Do You Yahoo!?
Yahoo! Auctions - buy the things you want at great prices
http://auctions.yahoo.com/

 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/